-(void)viewWillAppear:(BOOL)animated{

? ? [superviewWillAppear:animated];

? ? //系統(tǒng)發(fā)出的鍵盤(pán)通知有哪些

//? ? UIKeyboardWillShowNotification

//? ? UIKeyboardWillHideNotification

//? ? UIKeyboardDidHideNotification

//? ? UIKeyboardDidShowNotification

? ? [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(showKeyboard:) name:UIKeyboardWillShowNotification object:nil];

? ? [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(closekeyboard:) name:UIKeyboardWillHideNotification object:nil];

}

- (void)viewDidDisappear:(BOOL)animated{

? ? [superviewDidDisappear:animated];

? ? [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];

? ? [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];

}

-(void)showKeyboard:(NSNotification*)notification{

? ? //打印鍵盤(pán)的布局樣式信息

? ? NSLog(@"%@",notification.userInfo);

? ? NSInteger option = [notification.userInfo [UIKeyboardAnimationCurveUserInfoKey] integerValue];

? ? NSTimeInterval duration = [notification.userInfo [UIKeyboardAnimationDurationUserInfoKey] floatValue];

? ? CGFloat height = [notification.userInfo [UIKeyboardFrameEndUserInfoKey] CGRectValue].size.height;

? ? self.bottomConstraint.constant = height;

? ? [UIView animateWithDuration:duration delay:0 options:option animations:^{

? ? ? ? [self.view layoutIfNeeded];

? ? }completion:nil];

}

-(void)closekeyboard:(NSNotification*)notification{

? ? self.bottomConstraint.constant = self.textFieldConstant;

}